Well, for one they are albino and they can dig up things underground. Sometimes you may never even see a buried object but you can sense it and they are the only Pikmin who can dig up stuff. They are also Posionous they can be eaten by enemys and it hurts them. When I fight a boss sometimes I throw White Pikmin into them so they will get hurt. Another added bonus is they can disable posion traps that would kill any other Pikmin. So they are very helpful. But they are harder to get then all the other Pikmin except the Purple they are both hard to get.